/*

 * Copyright (C) 2020-2022 Huawei Technologies Co., Ltd. All rights reserved.

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.huaweicloud.common.event;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;

public class ClosedEventListener implements ApplicationListener<ApplicationEvent> {
  private final List<ClosedEventProcessor> processors = new ArrayList<>();

  public void addClosedEventProcessor(ClosedEventProcessor processor) {
    this.processors.add(processor);
  }

  @Override
  public void onApplicationEvent(ApplicationEvent event) {
    if (event instanceof ContextClosedEvent) {
      processors.sort(Comparator.comparingInt(ClosedEventProcessor::getOrder));
      processors.forEach(item -> item.process());
    }
  }
}
